Retransmissions in small data transmission sessions with a low-power wake-up signal

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, for at least one data packet, a request for a small data transmission (SDT) session with a network. The UE may receive a low-power wake-up signal (LP-WUS) from the network. The UE may receive, in the SDT session, control information from the network. The UE may transmit, in response to the LP-WUS and in the SDT session, the at least one data packet to the network. The at least one data packet may be transmitted based at least in part on the control information. Numerous other aspects are described.

What is claimed is: 
     
         1 . A user equipment (UE), comprising:
 a processing system that includes one or more processors and one or more code storing memories coupled with the one or more processors, the processing system configured to cause the UE to:
 transmit, for at least one data packet, a request for a small data transmission (SDT) session with a network; 
 receive a low-power wake-up signal (LP-WUS) from the network; 
 receive, in the SDT session, control information from the network; and 
 transmit, in response to the LP-WUS and in the SDT session, the at least one data packet to the network,
 wherein the at least one data packet is transmitted based at least in part on the control information. 
 
   
     
     
         2 . The UE of  claim 1 , wherein the processing system is configured to cause the UE to:
 receive a negative acknowledgement (NACK) from the network; and   retransmit, in response to the NACK and in the SDT session, the at least one data packet to the network.   
     
     
         3 . The UE of  claim 2 , wherein the processing system is configured to cause the UE to:
 receive an additional LP-WUS in response to the NACK,
 wherein the at least one data packet is retransmitted in response to the additional LP-WUS. 
   
     
     
         4 . The UE of  claim 2 , wherein the processing system is configured to cause the UE to:
 receive, in the SDT session, control information from the network,
 wherein the at least one data packet is retransmitted based at least in part on the control information. 
   
     
     
         5 . The UE of  claim 2 , wherein the NACK is received before expiry of a timer associated with a configured grant, and the at least one data packet is retransmitted according to the configured grant. 
     
     
         6 . The UE of  claim 2 , wherein the processing system is configured to cause the UE to:
 initiate a timer associated with retransmission in response to transmitting the at least one data packet,
 wherein the NACK is received before expiry of the timer associated with retransmission. 
   
     
     
         7 . The UE of  claim 2 , wherein the processing system is configured to cause the UE to:
 initiate a timer, associated with a minimum duration before a retransmission grant is expected, in response to transmitting the at least one data packet.   
     
     
         8 . The UE of  claim 7 , wherein a main receiver of the UE is powered off during the timer associated with the minimum duration before a retransmission grant is expected. 
     
     
         9 . The UE of  claim 7 , wherein the processing system is configured to cause the UE to:
 initiate a timer associated with retransmission in response to expiry of the timer associated with the minimum duration before a retransmission grant is expected,
 wherein the NACK is received before expiry of the timer associated with retransmission. 
   
     
     
         10 . A user equipment (UE), comprising:
 a processing system that includes one or more processors and one or more code storing memories coupled with the one or more processors, the processing system configured to cause the UE to:
 receive a paging message requesting a small data transmission (SDT) session with a network; 
 receive a low-power wake-up signal (LP-WUS) from the network; 
 receive, in the SDT session, control information from the network; and 
 monitor, in response to the LP-WUS and in the SDT session, for at least one data packet from the network,
 wherein the UE monitors for the at least one data packet based at least in part on the control information. 
 
   
     
     
         11 . The UE of  claim 10 , wherein the processing system is configured to cause the UE to:
 transmit a negative acknowledgement (NACK) to the network in response to failing to receive or decode the at least one data packet; and   monitor, in the SDT session, for a retransmission of the at least one data packet from the network.   
     
     
         12 . The UE of  claim 11 , wherein the processing system is configured to cause the UE to:
 receive an additional LP-WUS in response to the NACK,
 wherein the UE monitors for the retransmission in response to the additional LP-WUS. 
   
     
     
         13 . The UE of  claim 11 , wherein the processing system is configured to cause the UE to:
 receive, in the SDT session, control information from the network,
 wherein the UE monitors for the retransmission based at least in part on the control information. 
   
     
     
         14 . The UE of  claim 11 , wherein the processing system is configured to cause the UE to:
 initiate a timer associated with retransmission in response to transmitting the NACK,
 wherein the UE monitors for control information, associated with the retransmission, during the timer associated with retransmission. 
   
     
     
         15 . The UE of  claim 11 , wherein the processing system is configured to cause the UE to:
 initiate a timer, associated with a minimum duration before a retransmission grant is expected, in response to transmitting the NACK.   
     
     
         16 . The UE of  claim 15 , wherein a main receiver of the UE is powered off during the timer associated with the minimum duration before a retransmission grant is expected. 
     
     
         17 . The UE of  claim 15 , wherein the processing system is configured to cause the UE to:
 initiate a timer associated with retransmission in response to expiry of the timer associated with the minimum duration before a retransmission grant is expected,
 wherein the UE monitors for control information, associated with the retransmission, during the timer associated with retransmission. 
   
     
     
         18 . A method of wireless communication performed by a user equipment (UE), comprising:
 transmitting, for at least one data packet, a request for a small data transmission (SDT) session with a network;   receiving a low-power wake-up signal (LP-WUS) from the network;   receiving, in the SDT session, control information from the network; and   transmitting, in response to the LP-WUS and in the SDT session, the at least one data packet to the network,
 wherein the at least one data packet is transmitted based at least in part on the control information. 
   
     
     
         19 . The method of  claim 18 , further comprising:
 receiving a negative acknowledgement (NACK) from the network; and   retransmitting, in response to the NACK and in the SDT session, the at least one data packet to the network.   
     
     
         20 . The method of  claim 19 , further comprising:
 initiating a timer associated with retransmission in response to transmitting the at least one data packet,
 wherein the NACK is received before expiry of the timer associated with retransmission.